Rating System

LEED BD+C: New Construction

Rating System Version

v2 - LEED 2.2

Inquiry

The intent of this credit is to "Establish the minimum level of energy efficiency for the proposed building and systems." The requirements of this credit are as follows: - Comply with the mandatory provisions of ASHRAE Standard 90.1-2004. - Comply with the prescriptive requirements or performance requirements of ASHRAE Standard 90.1-2004. Mandatory lighting control provisions for Space Control break down on each space (Section 9.4.1.2.b). We would like to take exception to a particular space: - Covered Concourses: Section 9.4.1.2.b requires that a control device control a maximum of 10,000 square-feet area for a space greater than 10,000 square-feet. The covered concourses are to be controlled by four separate zones according to quadrant on each level. The zone\'s sizes are varied from 9,000 square-feet to 45,000 square-feet. - We ask that each quadrant on each level can be controlled by a single control device. Table 9.6.1 of the Standard lists Lighting Power Densities Using the Space-by-Space Method. We would like to clarify the space type used and the corresponding lighting power density for the following: - Covered Concourses: Table 9.6.1 lists Mall Concourse, which most closely represents the covered concourses of the ballpark, at 1.7 watts per square foot. Light levels for covered concourses are designed to be an average of 7 to 10 foot candles. These spaces are used for circulation, gathering space, and retail. In addition, most of the fixtures are surface mounted at ceiling height (average of 23\'-0") due to clearance requirements in the covered concourses. - We ask that a lighting power density of 1.7 watts per square foot be accepted. - Dugouts, Bullpens, Batting Tunnels: Table 9.6.1 lists Court Sports Area, which most closely represents the function of these spaces, at 2.3 watts per square foot. Light levels for these areas are designed to be an average of 75 foot candles. - We ask that a lighting power density of 2.3 watts per square foot be accepted. Table 9.4.5 of the Standard lists Lighting Power Densities for Building Exteriors. We would like to clarify the tradable surfaces used and the corresponding lighting power density for the following: - Open Outdoor Concourses: Table 9.4.5 lists Outdoor Sales, which most closely represents the open outdoor concourses of the ballpark, at 0.5 watts per square foot. Light levels for these areas are designed to be an average of 7 to 10 footcandles. These spaces are a continuation of the covered concourse area and are used for circulation, gathering space, and retail. - We ask that a lighting power density of 0.5 watts per square foot be accepted.